hi sure it will effect your results to change the material type go to define-material then material type as a sold then press database select sold again pull down the sold material database you will find stell if this is the properties you looking for this good if it is not make all the changes in the properties then press change/create. in boudray condition change the sold zone to stell. good luck

Hi Hassan Thanks for the responds. Before you sugested it, I have done the same procedure. But the material type ie.:Al still apears, it could not be deleted. What I want is, the Al material deleted then changed to steel material.

Now I am thinking, even the Al may not deleted from the display panel then follow the procedure you have mentioned, is the new material ( ie.: steel) will take effect?